All 3 alliance quest-lines before coldharbor.

roguestrike01ub17_ESO

Would it be possible and or recommended to do all 3 of the alliance quest-lines before going to coldharbor. For me it would make more sense story-wise but I am unsure of any odd consequences.

Enodoc

Possible, yes. Whether you want to do so is entirely up to you. The only slightly odd consequences are when the Main Quest tells you to go there in Cadwell's Silver, you'll already have done it. Which just means you should be able to turn in that quest straight away.

roguestrike01ub17_ESO

thanks that's the plan then it makes more sense in the story than magical time traveling, and people telling me I don't have a soul when I got it back already.